For making a new claim before appellate authorities filing of revised return not necessary

one of known person paid excess interest amount about Rs.7500, erroneously for asst year 2009-10 on the asst order and  the addl demand of incometax . please how to claim back that amount of interest excess paid to the dept., The dept also not isseued any rectification order with refund of excess interest received fro the assessee…pls advise